The NIRVANDELS Survey: a robust detection of α-enhancement in star-forming galaxies at z ≃ 3.4

被引：58
|
作者：
Cullen, F. [1 ]
Shapley, A. E. [2 ]
McLure, R. J. [1 ]
Dunlop, J. S. [1 ]
Sanders, R. L. [3 ]
Topping, M. W. [2 ]
Reddy, N. A. [4 ]
Amorin, R. [5 ,6 ]
Begley, R. [1 ]
Bolzonella, M. [7 ]
Calabro, A. [8 ]
Carnall, A. C. [1 ]
Castellano, M. [8 ]
Cimatti, A. [9 ,10 ]
Cirasuolo, M. [11 ]
Cresci, G. [10 ]
Fontana, A. [8 ]
Fontanot, F. [12 ]
Garilli, B. [13 ]
Guaita, L. [14 ]
Hamadouche, M. [1 ]
Hathi, N. P. [15 ]
Mannucci, F. [10 ]
McLeod, D. J. [1 ]
Pentericci, L. [8 ]
Saxena, A. [16 ]
Talia, M. [7 ,9 ]
Zamorani, G. [7 ]
机构：
[1] Univ Edinburgh, Inst Astron, Royal Observ, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland
[2] Univ Calif Los Angeles, Dept Phys & Astron, 430 Portola Plaza, Los Angeles, CA 90095 USA
[3] Univ Calif Davis, Dept Phys & Astron, One Shields Ave, Davis, CA 95616 USA
[4] Univ Calif Riverside, Dept Phys & Astron, 900 Univ Ave, Riverside, CA 92521 USA
[5] Univ La Serena, Inst Invest Multidisciplinar Ciencia & Tecnol, Raul Bitran 1305, La Serena, Chile
[6] Univ La Serena, Dept Fis & Astron, Av Juan Cisternas 1200 Norte, La Serena, Chile
[7] INAF Osservatorio Astron Bologna, Via P Gobetti 93-3, I-40129 Bologna, Italy
[8] INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, RM, Italy
[9] Univ Bologna, Dept Phys & Astron DIFA, Via Gobetti 93-2, I-40129 Bologna, Italy
[10] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy
[11] European Southern Observ, Karl Schwarzschild Str 2, D-86748 Garching, Germany
[12] INAF Astron Observ Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy
[13] INAF IASF Milano, Via Bassini 15, I-20133 Milan, Italy
[14] Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile
[15] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
[16] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 505卷 / 01期
基金：
英国科学技术设施理事会;
关键词：
galaxies: abundances; galaxies: high redshift; MASS-METALLICITY RELATION; NEAR-INFRARED SPECTROSCOPY; EMISSION-LINE GALAXIES; MOSDEF-LRIS SURVEY; STELLAR METALLICITY; VANDELS SURVEY; IONIZED-GAS; FORMATION HISTORIES; PHYSICAL-PROPERTIES; NON-LTE;
D O I：
10.1093/mnras/stab1340
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present results from the NIRVANDELS survey on the gas-phase metallicity (Z(g), tracing O/H) and stellar metallicity (Z(star), tracing Fe/H) of 33 star-forming galaxies at redshifts 2.95 < z < 3.80. Based on a combined analysis of deep optical and near-IR spectra, tracing the rest-frame far-ultraviolet (FUV; 1200-2000 angstrom) and rest-frame optical (3400-5500 angstrom), respectively, we present the first simultaneous determination of the stellar and gas-phase mass-metallicity relationships (MZRs) at z similar or equal to 3.4. In both cases, we find that metallicity increases with increasing stellar mass (M-star) and that the power-law slope at M-star less than or similar to 10(10)M(circle dot) of both MZRs scales as Z proportional to M-*(0.3). Comparing the stellar and gas-phase MZRs, we present direct evidence for super-solar O/Fe ratios (i.e. alpha-enhancement) at z > 3, finding (O/Fe) = 2.54 +/- 0.38 x (O/Fe)(circle dot), with no clear dependence on M-star.
引用
收藏
页码：903 / 920
页数：18
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